Sub ReLinkFootNotes()
Dim i As Long, j As Long, k As Long, l As Long, FtRng As Range
Application.ScreenUpdating = False
With ActiveDocument
  Set FtRng = Selection.Range
  With FtRng
    .Style = "Footnote Text"
    With .Find
      .ClearFormatting
      .Replacement.ClearFormatting
    ' Change '[' and ']' on the next line to whatever is appropriate if the selected
    ' footnotes' numbers are enclosed in characters other than square brackets
    ' (e.g. .Text = "([0-9]{1,})" if there are no brackets)
      .Text = "\[([0-9]{1,})\]"
      .Replacement.Text = "\1"
      .Forward = True
      .Wrap = wdFindStop
      .Format = True
    ' Delete the next line if the footnote references are not superscripted.
      .Font.Superscript = True
      .MatchCase = False
      .MatchWholeWord = False
      .MatchAllWordForms = False
      .MatchSoundsLike = False
      .MatchWildcards = True
      .Execute Replace:=wdReplaceAll
    End With
    k = .Paragraphs(1).Range.Words(1) - 1
    j = k
    l = ActiveDocument.Footnotes.Count - k
    For i = 1 To .Paragraphs.Count
      If .Paragraphs(i).Range.Words(1) = j + 1 Then
        j = j + 1
      End If
    Next i
  End With
  For i = k + 1 To j
    StatusBar = "Finding Footnote Location: " & i + l
    With .Content.Find
      ' Change '"[" & i & "]"' string on the next line to whatever is appropriate
      ' if the in-line references are not enclosed in square brackets
      .Text = "[" & i & "]"
      ' Delete/comment out the next line if not applicable
      .Font.Superscript = True
      .MatchWholeWord = True
      .MatchWildcards = False
      .Execute
      If .Found = True Then
        .Parent.Select
        With Selection
          .Delete
          .Footnotes.Add Range:=Selection.Range, Text:=""
        End With
      End If
    End With
  Next i
  With FtRng
    For i = k + 1 To j
      StatusBar = "Transferring Footnote: " & i + l
      With .Paragraphs(1).Range
        .Cut
        With ActiveDocument.Footnotes(i + l).Range
          .Paste
          .Words(1).Delete
          .Characters.Last.Delete
        End With
      End With
    Next i
  On Error Resume Next
  End With
  Set FtRng = Nothing
End With
Application.ScreenUpdating = True
End Sub

"\[([0-9]{1,})\]"

"\(([0-9]{1,})\)"